add logic to enforce hard limit on order creation

4 files changed, 127 insertions, 0 deletions

diff --git a/src/backenddb/Makefile.am b/src/backenddb/Makefile.am
index 792bfb53..af79c4f6 100644
--- a/src/backenddb/Makefile.am
+++ b/src/backenddb/Makefile.am
@@ -104,6 +104,7 @@ libtaler_plugin_merchantdb_postgres_la_SOURCES = \
   pg_insert_instance.h pg_insert_instance.c \
   pg_account_kyc_set_status.h pg_account_kyc_set_status.c \
   pg_get_kyc_status.h pg_get_kyc_status.c \
+  pg_get_kyc_limits.h pg_get_kyc_limits.c \
   pg_account_kyc_get_status.h pg_account_kyc_get_status.c \
   pg_delete_instance_private_key.h pg_delete_instance_private_key.c \
   pg_purge_instance.h pg_purge_instance.c \
diff --git a/src/backenddb/pg_get_kyc_limits.c b/src/backenddb/pg_get_kyc_limits.c
new file mode 100644
index 00000000..d6249e56
--- /dev/null
+++ b/src/backenddb/pg_get_kyc_limits.c
@@ -0,0 +1,75 @@
+/*
+   This file is part of TALER
+   Copyright (C) 2024 Taler Systems SA
+
+   TALER is free software; you can redistribute it and/or modify it under the
+   terms of the GNU General Public License as published by the Free Software
+   Foundation; either version 3, or (at your option) any later version.
+
+   TALER is distributed in the hope that it will be useful, but WITHOUT ANY
+   WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
+   A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License along with
+   TALER; see the file COPYING.  If not, see <http://www.gnu.org/licenses/>
+ */
+/**
+ * @file backenddb/pg_get_kyc_limits.c
+ * @brief Implementation of the get_kyc_limits function for Postgres
+ * @author Christian Grothoff
+ */
+#include "platform.h"
+#include <taler/taler_error_codes.h>
+#include <taler/taler_dbevents.h>
+#include <taler/taler_pq_lib.h>
+#include "pg_get_kyc_limits.h"
+#include "pg_helper.h"
+
+enum GNUNET_DB_QueryStatus
+TMH_PG_get_kyc_limits (
+  void *cls,
+  const char *merchant_account_uri,
+  const char *instance_id,
+  const char *exchange_url,
+  bool *kyc_ok,
+  json_t **jlimits)
+{
+  struct PostgresClosure *pg = cls;
+  struct GNUNET_PQ_QueryParam params[] = {
+    GNUNET_PQ_query_param_string (merchant_account_uri),
+    GNUNET_PQ_query_param_string (instance_id),
+    GNUNET_PQ_query_param_string (exchange_url),
+    GNUNET_PQ_query_param_end
+  };
+  struct GNUNET_PQ_ResultSpec rs[] = {
+    GNUNET_PQ_result_spec_bool ("kyc_ok",
+                                kyc_ok),
+    GNUNET_PQ_result_spec_allow_null (
+      TALER_PQ_result_spec_json ("jaccount_limits",
+                                 jlimits),
+      NULL),
+    GNUNET_PQ_result_spec_end
+  };
+
+  check_connection (pg);
+  PREPARE (pg,
+           "get_kyc_limits",
+           "SELECT"
+           " mk.kyc_ok"
+           ",mk.jaccount_limits"
+           " FROM merchant_kyc mk"
+           " WHERE mk.exchange_url=$3"
+           "   AND mk.account_serial="
+           "   (SELECT account_serial"
+           "      FROM merchant_accounts"
+           "     WHERE payto_uri=$1"
+           "       AND merchant_serial="
+           "       (SELECT merchant_serial"
+           "          FROM merchant_instances"
+           "         WHERE merchant_id=$2));");
+  *jlimits = NULL;
+  return GNUNET_PQ_eval_prepared_singleton_select (pg->conn,
+                                                   "get_kyc_limits",
+                                                   params,
+                                                   rs);
+}
diff --git a/src/backenddb/pg_get_kyc_limits.h b/src/backenddb/pg_get_kyc_limits.h
new file mode 100644
index 00000000..b630003e
--- /dev/null
+++ b/src/backenddb/pg_get_kyc_limits.h
@@ -0,0 +1,48 @@
+/*
+   This file is part of TALER
+   Copyright (C) 2024 Taler Systems SA
+
+   TALER is free software; you can redistribute it and/or modify it under the
+   terms of the GNU General Public License as published by the Free Software
+   Foundation; either version 3, or (at your option) any later version.
+
+   TALER is distributed in the hope that it will be useful, but WITHOUT ANY
+   WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
+   A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License along with
+   TALER; see the file COPYING.  If not, see <http://www.gnu.org/licenses/>
+ */
+/**
+ * @file backenddb/pg_get_kyc_limits.h
+ * @brief implementation of the get_kyc_limits function for Postgres
+ * @author Christian Grothoff
+ */
+#ifndef PG_GET_KYC_LIMITS_H
+#define PG_GET_KYC_LIMITS_H
+
+#include <taler/taler_util.h>
+#include <taler/taler_json_lib.h>
+#include "taler_merchantdb_plugin.h"
+
+/**
+ * Check an account's KYC limits at an exchange.
+ *
+ * @param cls closure
+ * @param merchant_payto_uri  merchant backend instance ID
+ * @param instance_id the instance for which to check
+ * @param exchange_url base URL of the exchange
+ * @param[out] kyc_ok true if no urgent KYC work must be done for this account
+ * @param[out] jlimits set to JSON array with AccountLimits, NULL if unknown (and likely defaults apply or KYC auth is urgently needed, see @a auth_ok)
+ * @return database result code
+ */
+enum GNUNET_DB_QueryStatus
+TMH_PG_get_kyc_limits (
+  void *cls,
+  const char *merchant_account_uri,
+  const char *instance_id,
+  const char *exchange_url,
+  bool *kyc_ok,
+  json_t **jlimits);
+
+#endif
diff --git a/src/backenddb/plugin_merchantdb_postgres.c b/src/backenddb/plugin_merchantdb_postgres.c
index 690f066e..86dec660 100644
--- a/src/backenddb/plugin_merchantdb_postgres.c
+++ b/src/backenddb/plugin_merchantdb_postgres.c
@@ -33,6 +33,7 @@
 #include "pg_helper.h"
 #include "pg_insert_otp.h"
 #include "pg_get_kyc_status.h"
+#include "pg_get_kyc_limits.h"
 #include "pg_delete_otp.h"
 #include "pg_update_otp.h"
 #include "pg_select_otp.h"
@@ -584,6 +585,8 @@ libtaler_plugin_merchantdb_postgres_init (void *cls)
     = &TMH_PG_select_category_by_name;
   plugin->get_kyc_status
     = &TMH_PG_get_kyc_status;
+  plugin->get_kyc_limits
+    = &TMH_PG_get_kyc_limits;
   plugin->select_category
     = &TMH_PG_select_category;
   plugin->update_category